Draw-press



0. 3. BOETTCHEB. DRAW PRESS. APPLICATION FILED -MAY24. 1920.

IS F /8/ j Patented Jan. 25,1921.

' UNITED, STATES PATENT; OFFICE.

o'r'ro JOHN BoE'rToH n, or MANITOWOC, WISCONSIN.

DRAW-PRESS.

-specification of Letters Patent.

Patented Jan. 25, 1921.

Application filed May 24, 1920. Serial No. 383,892. c

To all whom it may concern:

Be it known that I, O'rro J. Bon'r'rorrnn, a citizen of the United States, residing at Manitowoc, in the-county of Manitowoc and State of Wisconsin, have invented certain new and useful Improvements in -Draw-.

Presses, of which the following is a specification. a V

I This inventionrelates topresses for drawing sheet metal shells and other similar articles by means "of drawing punches'and dies; and it'consists in the novel construction and combination of the parts forming an attachment for the press as hereinafter fully described and claimed. I j

In the drawings, Figure 1 is a front view of portions of a press provided with an attachment according to this invention, some of the parts being shown in section. Fig.2

is a sectional plan-view of the crossheador ram, taken on the line 2.2 in Fig. 1,

The press is provided with a frameB' having a stationary horizontal press bed 4 at its lower part. The crosshead or ram of the press, which carries the drawing punch 6, is slidable in vertical guides? on the frame,

and is reciprocated by means of a connect ing-rod 8 and any suitable driving mechanism, all; of these Partsbeing of any'approved construction. j r

In re-drawing light. metal shells, and other similar articles, in presses of this sort, the shells sometimes buckle-up, wrinkle and tear, and the attachment hereinafter described is adapted to overcome these drawbacks, and improve the efiiciency of the machine.

Supportmg bars-9 are rigidly secured to theunderside of the crosshead 5, and project horizontally at the front and rear of the machine. Vertical rods 10 are arranged to slide in holes 11 inthe bars 9, and, have screwthreaded portions 12 at their upper ends Nuts 14 are screwed on the. rods 10 above the bars, so that the rods are suspendedfrom thebars 9, and jam nuts 15 are provided for locking the nuts l lafter the rods 10-h'avebeen adjusted in length.

The. lower end portions ofithe rods 10 are provided with extension rods 16, andv a sleeve holder 17 is secured to the rods 10 where they are connected to the extension rods 16. The sleeve holder 17 extends diagonally under the crosshead 5 of the press, and is arranged horizontally. The extension rods 16 may be solid metallic rods if desired,

lightness, when preferable.

or they may be formed of steel tubes for lower ends which are screwed into the upper end portions of the extension rods 16, and

collars 19 are provided on the rods 10, so

that the sleeve holder 17 is clamped between the collars 19 and the upper ends of the extension rods. The sleeve holder may.how ever be rigidly connected to the rods 10 in any other approved manner.

A tubular sleeve 20 is secured to. the middle part of the sleeve holder and has a beveled portion 21 at its lower part. The drawpnnch is slidable in this sleeve, and in a hole 23 in the sleeve holder. A suitable die 22 is secured to the press bed for the drawing punch to engage with in the usual mannen The sleeve 20 slides Vertically with the crosshead 5 and the drawing punch 6, but the crossheadand punch have a longer stroke than the sleeve. The punch 6 slides downwardly in the sleeve when the latter is held stationary by contact with the wor r.

The extension rods 16 are slidable vertically in holes 24 in the press bed, and they have screwthreaded portions 25 at their upper parts. Split nuts 26 are screwed on the parts 25 above the press bed, and thesenuts form stops as will be more fully explained hereinafter. The split nuts 26 may be dispensed with, if desired. i

The extension rods 16 have sorewthreaded portions 28' at their lower ends, and are provided with adjusting nuts 29. Helical springs 30 are arranged around the lower parts of the extensionrods 16 between the nuts 29 and the press bed, and31 are cen' tering washers which. support the springs 30 on the extension rods.

hen the various parts of the attachment havebeen put together as shown in the drawings, thenuts-M are 'first adjusted and are screwed downwardly on the'rods 10 against the bars -9 until the bottom edge, of

that the sleeve is raised a little and is held away from the die at a distance equal to the thickness of the metal of the shell or other article to be drawn out. The nuts 29 are ,then screwed on the extension rods, so as to compress the helical springs to apredetermined extent, and the press is ready to operate.

'The shell is placed between the die and the sleeve, when the sleeve and drawing 7 'punch are raised. its the crosshead is forced down, the sleeve entersltheshell and slides downwardly until it presses the shell against the die. The springs 30 are placed under considerable tension or compression when thecrosshead 5 is raised, and they press the v nuts-14 on the supporting'bars 9 until the beveled end 21 of the-sleeve 20 bears on the shell The springs 30, or other equivalent operating means, then hold the shell pressed against the stationary die with a constant and uniform pressure. This pressure prevents the shell from being distorted while it' s being drawn out by the drawing punch.

' Thesplit nuts 26, when used, are adjusted upon the scre'wthreaded rods 16, so as to permit the'springs30 to hold the shell gripped between the sleeve 20 and the stationary die'22 to the best advantage. The continued descent of w the crosshead 'iorces the drawing punch through the die.

to draw outthe shell, and the bars 9 slide vertically over the rods 10. When the crosshead is raisedthe bars .9 engage with the nuts 14, and raise the sleeveto its original position so that another shellcan be inserted und'er'it. v

"The supporting and pressing action oi thesleeve inside thQ'SllGll, enables the shell to be' idrawn out successfully to a much greater-extent at'a single stroke, than is possible when no suchsleeve is provided, and the shell is formed with a smooth surface and-is free from cracks and wrinkles;

. -Whatl claim is:

1; The combination, with a single-acting press provided with a stationary die, and having a slidable crosshead arral'iged above the die, and a drawing punch secured to the said crosshead yer" an attachment compris ing a sleeve holder arranged between the Saidcrosshead anddie, a sleeve secured to the sleeve holder and encircling the said punch, suspending rods secured to the sleeve holder, asupport for said rods secured to the crosshead and provided with openings iOl'JilllGSitlCl rods to slide. 1n,nuts secured *on the rods above their said support and aiifording a means for adjusting the sleeve verticallywith relation to the punch, and meansfor' pressingv the sa d sleeve down- "affordin a means for'ad'usting the sleeve t: i v x with relation tothe punch, rods secured t the sleeve holder and sliding in holes in the c said bed and providedwithnuts'on their lower end portions, and springs encircling therla'st said rods aildnrranged between their said nuts and-the bed and operating to press the aid sleeve on the work while the punch is drawing it out.

3. The combination with a a stationary bed and 'die, said press also a sli'dable .crosshead and draw punch; of'a sleeveholder arranged press ha ring 7 l. n i

I oetween the'crosshead'and the press bed, a sleeve secured to-the sleeve holder and encircling thepunch, supporting rods secured to the sleeve holder and slidably connected wi 11 r the crosshead and permitting the sleeve to slide downwardly with the punch during the first art of its stroke rods secured to the crosshead ad us'table stoa nuts screwed on tl1 last-said rods and arranged above the press bed, and springs connected to the last said rods and operating 'tepress' the sleeve on the work while the'punch'is; drawing it out. f V

t.' Tl1ecombinatioinivitha press having a stationary bed and die, said press having also a l 'slidable cross'heald and drawing punch; of a sleeveholder arranged betwee'. the crosshead and the press'bedfa sleeve secured to the sleeve holder and encircling the said punch, supporting'rods secured to the 'sleeveholder and slidably' connected with the crosshead and permitting the sleeve to slide downwardly with the punch dnri mg the first part otits'strok a'ods secured to i the crosshead and slidablein hole's'in the press bed, adjusting nuts screwed on um lower-end portions of the last said rods, and springs arranged between "thesaid nuts and thepress bed and operating to press the said crosshead, and sleeve downwardly;

I In testimonywhereof I have-affixed my signature; 1 V

o rro JOHN BonrroHnn 

